Improved dbedgbstg-box



' '-*lenrr mesigiiww--e THOMAS WILLIAMS '0F BGSTO'N@ MASSACHUSETTS.,

I v Letters .Patent No. 66,661,- ci'ated Julyg, 1867, l i v nraovsnnaeoemefsor.

@te Srliehih retentit. hi ligrse t-stints @mit mit noting tutt nur.

TO ALL WIIOM IT MAY CONCERNz' l Be it-lcnown that I, TIIGMAS WfLLIA-Mmbf Boston, lin the county oft' Suffolk, and Stato of Massachusetts, l, have invented an improvement -in Dredging-Boxes; and I do hereby declare that the following, taken in com nection with the drawings which accompany and form part of this specification, is a description of invention 'f suiiicicnt to. enable those skilled in the artv to .practise it.

This inventionrelates to that classof implements which may be classed under the head of dredging-boxes, the purpose of'which isto deliver, through numerous openings and over considerable surface, mattcrin the form of powder or granules.

. The'object of my invention is to. loosen and disintegrate lumps of material that may bcplacedin a d f bcx, or whichmay vconcrete therein. il The invention is of especial utility when applied for the disintegration and delivery of salt, that ni;

being specially liable to harden'into lumps, but it is alsouscfulin the same way in'its act-ion on various mat My invention consists in applying to a v es s el p l,c i sed with a perforated cover a cortical or pointed inw projecting hollow perforated piece, through and/into which the contents of the vessel must pass in esc therefmmbthcgne a@prgsgajgealceg ngainstjtllc cnil of "ivliicihplumpghare brokcnwhen they impinge, not of shaking the dredge-box and its contents. v i .l It also consists in providing any hollow body attached to tho perforated cover of a d"cdgebox, and. th -and into which the material must pass before escaping from the dredge-box, with projections or l scrratic 'remove particles from the lumps of material shaken against them. I

The drawing shows a dredge-box with my improvement added thereto, the view being a vertical c section through the box, exhibiting, half in eleva-tion and half in similar section, my new device.

ais the body of the dredge-box, which may be of any suitable form or material. b is the perforated cover, und c is the hollow body, shielding the perforated cover from direct contact with the mass of the contents of a, and projecting inwardly in a tapering form, terminating in or nearly in a point, and being perforated as shown. To makc, on the convex surface of c, teeth or asperities with which to rasp or abiade particles from the lumps of the material with which a is filled, the perforations are preferably made by mere displacement of the material of c, instead of by entirely removing the material. l

The ordinary ditiiculty experienced with common dredge-boxes, viz, the compacting of the contents against thc perforated cover, is avoided where my improvement is used, and as the annular space between the pi andthe upper part of the body a is flaring downwards, the tendency of the contents to compact-iu said ..s very slight.`

` I claim, in combination with *the body and perforated cover of a dredge-box, a perforated inwardly-proje hollow conical or pointed body c, arranged to operate substantially as described.

Also, in combination with. thleubodyiand perforated cover of @dredge-box, a perforatetl l iol lo\v body i posed between said cover and the contcnts'of sai-'1 body, when provided with asperitics, substantially as an the purpose specified.

THOMAS WILLIAMS.

Witnesses:

J. B. Cnosnr, FRANCIS GoULD. 

